Which province of Argentina accounts for over 70% of all wine produced in the country?

Mendoza is the province in Argentina responsible for over 70% of the country's wine production. This significant contribution to the national output is due to several factors inherent to Mendoza's geography, climate, and established wine culture. The region is characterized by a high desert environment, which, combined with the Andes Mountains' altitude, creates ideal conditions for grape growing. The climate allows for a long growing season, with hot days and cool nights that help develop the grapes' flavor complexity while preserving acidity.

Additionally, Mendoza is home to many of Argentina's most prestigious vineyards and wineries, where a diverse range of grape varieties are cultivated, including Malbec, which has become synonymous with Argentine wine. The region's infrastructure, including technological advancements in viticulture and winemaking, further enhances its capacity to produce high-quality wines, thus solidifying its dominance in the country's overall wine production.